Underguard of an automobile



FIG. 1 is a front elevation view of an underguard of an automobile, showing our new design;

FIG. 2 is a front right perspective view thereof; and,

FIG. 3 is a front left perspective view thereof.

The broken lines shown are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for, an underguard of an automobile, as shown and described. 